# encoding=utf-8

money = 50

money = money - 60
print(money)

# 变量
money = 70
print(money)
# <class 'int'>
print(type(money))
# <class 'str'>
print(type("hello"))

# 变量没有类型，python是弱类型语言
money = "hello world"
print(money)
print(type(money))

# <class 'NoneType'>
print(type(print("type")))
print(type(print()))

# True
print(print() == None)
# True
print(print() is None)

